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We have been experimenting with overwriting by magnetic field modulation using flying magnetic heads and single-sided disks. We developed a new protective layer for the disks. This is a spin-coated polymer layer containing α-Fe203 powder. It holds lubricating oil well and increases durability. We obtained good read-write characteristics using the protective layer on a reflective structure disk.
H. Izumi,Masakazu Taguchi,Toshikatsu Narumi,Kazunori Naitou,Fumitaka Abe, andHiroshi Inoue
"Overwrite characteristics of magneto-optical disks by magnetic field modulation", Proc. SPIE 1316, Optical Data Storage, (1 August 1990); https://doi.org/10.1117/12.22013
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H. Izumi, Masakazu Taguchi, Toshikatsu Narumi, Kazunori Naitou, Fumitaka Abe, Hiroshi Inoue, "Overwrite characteristics of magneto-optical disks by magnetic field modulation," Proc. SPIE 1316, Optical Data Storage, (1 August 1990); https://doi.org/10.1117/12.22013